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Yamaha XT600E 3TB - cold starting problems Yamaha XT600E 3TB - cold starting problems
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #61  
Old 6 Mar 2018
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Quote:
Originally Posted by jjrider View Post
When you take the bowl off there is a brass tube that sticks down into a hole in the bowl itself , there should be an o-ring around it. There is a small hole at the bottom of the bowl next to that tube hole that must be open so fuel from the bowl can fill it. That tube is what feeds the choke . It is common for that little hole to get plugged if fuel has dried out at some point and is really hard to get open again .

None of these motor should need bigger than a #48 pilot and that's even a bit big from all the XT's I've had but it may be possible . There is a couple small feeder passages on these carbs that if partial blocked will cause hard starting cold , they're kind of a fussy design.


.
The small opening in the bowl for the choke tube is clear also the tube because I've sprayed carb cleaner (a lot) inside both parts and they are 100% open. I will have to check for the o-ring next time I open them up ! Not sure if it's there but I will put one if it's missing.

I haven't bought this bike new ... I just invested a lot of time and money in it to make it as best as I can (afford).

The #48 jet will arrive this week maybe the next and I will definitely check what you mentioned when I change the jet.

Thanks a lot for trying to help me guys ! The help I can get here (my small town) is very limited and most mechanics work from self learned experience (which is most of the time not accurate and appropriate).
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  #62  
Old 8 Mar 2018
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The kit arrived ! Do you guys recommend that I change everything or just use the 48# pilot and adjust the fuel level a bit from 27mm to 25mm.

This is my main plan just to change the idle jet and a minor fuel level adjustment. I will also trow in a new spark ... (its been maybe 200 km with the old one). I just want to make sure all the start conditions are optimal and it should start very easily I hope.

The battery is on trickle charger and performs at its peak.
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  #63  
Old 9 Mar 2018
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I’ve changed the pilot jet to #48 and the starting is great !

I looked at the hole diameter of the existing one (old one) compared to the #48 new one and the diameter of the hole was much bigger ... hence the old pilot jet (unknown size) was clogged up ... I can’t believe I couldn’t clean it ... I’ve stuck a needle and boiled it and used some compressed air after and eventually it cleared up ...

So the fix was so simple but I guess I have to learn from my own mistakes.

The bike is really running as it should !
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  #64  
Old 10 Mar 2018
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Awesome, great news.
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  #65  
Old 10 Mar 2018
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Yes indeed ! It started first attempt yesterday and today no problems at all (engine cold or warm). Really happy now !

I even managed to dial in a mixture screw perfectly and it idles and starts really nicely.

It's an old bike but still gives me the thrills and makes me grin when I accelerate on a forest road !

Don't think I will ever change it just hope to find parts in the distant future.

I already started to buy second hand parts (in good condition) to have it when I will be needing them. Sometimes you can find them cheap and I just can't help myself buying a few.
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